Signaling apparatus for telephone-exchange systems



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. I J.H.OARY.

SIGNALING APPARATUS RQR TELEPHO NE EXCHANGE SYSTEMS.

No. 529,894. Patented Nov: 27, 1894..

1' CHRIS PEIERS 0a., mmoumm. WASHINGTON n c 3 sheetsslieet 2.

(N0 Model.)

J. H. CARY- SIGNALING APPARATUS FOR TELEPHONE EXCHANGE SYSTEMS; No. 529,894.

PatentedNov. 27, 1894'.

\MTNESEEE: INVENTQR:

n1: "ORR 3 Sheets-Sheet 3..

(No Model.)

JJLOARY. SIGNALING APPARATUS FOR TELEPHONE EXCHANGE SYSTEMS. .No. 529,894.

Patented 'Nov. 27-, 1894;

INVENTDRI ITNEEEI E5: M 4 M 4 mus runs :42. FnuroL'nmq. wnsumcrmu n, c.

UNTTED STATES PATENT OFFICE.

JAMES :H. LQARY, or MADDEN, Ass IcNoR or ONE-HALE'QTQ LUTHER P.

- BRYANT, or NORTHAMPTON, MASSACHUSETTS;

SIGNALING APPARATUS 50R TELEPHONE-EXCHANGE SYSTEMS.

SPEGIFIGACPION forming part of Iletters Patent N 0. 529,894, dated November 27, 1894.

hp llcation filed March 17, 1894.

To all whom itmay cancer n..- v Be it known that LJAMES H. CARY, of Malden, in the county of Middles ex and State of Massachusetts, haveinvented certain'new and useful Improvementsin Signaling Apparatus for elephone-Exchange Systems, of which the following is a specification. v

This invention relates: to signaling apparatus for use in telephone systems where a number of sub-stations are located on one iineradiating from a central operating staion. My invention has for its object to provide a system of calling any particular sub-station without signaling any other sub-station on the line, by the employment of magneto or voltaic currents, varying-in quality or in'di rection 0r polarity, whereby the different parts of the mechanism at the substations are operated to effect the desiredresults. I

employ at the central station magneto or dynamo machines or batteries, which may be operated with keys to send currents of given polarity and strength to the line, to cause the operation of the appropriate mechanism at the several sub-stations, to respond to the particular cur'rent'for which each particular mechanism is adapted.

In my Letters Patent dated July 17, 1883, I describe andillustratea form of the gen erator combined with keysfor producing the desired result. I also in Letters Patent dated January 6, 1885, have described in detailwith illustrationsa type of apparatus to be used at the sub-stations, and it will be seen that in the apparatus shown in this patent I arrange signals at'the sub-stations in series.

An improvement in the present system consists in arranging them in multiple, to secure the proper operation of which the electro-magnets in each instrument at the substations will be wound at high resistance.

My invention also contemplates an improved switchboard adapted to control cur rents as used in connection with the ordinary switchboard of the telephone exchange, and also an arrangement of circuits whereby the signaling apparatus maybe connected with the telephone-apparatus in ordinary use at fserin No. 504,047. (Noinodehl the subscribers station, so that the trans- 5o mitter battery in use at such sub-stations may be utilized to operate the signal bell by being properly connected through the signaling apparatus at each sub-station.

Referring to the accompanying drawings which illustrate an embodiment of the inven-' tion,' Figure 1 represents a plan view of the relay or individualizing apparatus. Fig. 2 represents an upright or sideview of the same, With a diagram of the local circuit. Fig. 3

represents a detail of the polarized magnet. Fig. 4 represents a detailof the knife-edged contact. Fig. 5 is a' diagram of switch and connections to power, generator and switchboard, thence to the several sub-stations on the line. Fig. 6 represents a sectional detail of the switch. f Fig. 7 shows the arragement of circuits from the local battery to the .local circuit of the relay, and "thence to the signal bell. Fig. 8 is a diagram showing cir- 7o cuits'through a numberof stations.=

Referring first to Figs. 1 to'4,'the letters f and f designate vertical and horizontal bars of the supporting frame of the relay; M, electro magnets supported by'the frame and connected with the line by wires, u and o, and binding-posts, m and a, said magnets being wound at high resistance; a, an armature ex tending across the ends of the magnets, and supported by an arm, a, pivoted tothe vertical bar, f; s, a retroacting spring connected with said arm, a; K, an adjusting screw to regulate the'tensionofsaid spring; rand 1", soft rubber pads on the arm, a, and designed to: impinge against the screws, g and h, and 8 5 prevent a click in the operation of the ap pa'ratu's; d, a spring projecting from the back .of the casing and having a=knife-edge contact e forfengagement with a similar contact, e,'on the arm, a; 10, a polarized armao ture pivoted to the bar, f, and depending between the magnets; b,"a spring secured to the frame and extending out past the upper part of the polarized armature; c'and a, knifeedged contacts fastened 'to the spring and 5 armature respectively; t and t, non-magnetic springs I fastened on oppositesides of the armature, p, and designed to prevent the latter remaining in contact with the pole-pieces of the electromagnets after the actuating current has ceased to flow.

Fine wires, '5 and j are employed to secure perfect electrical connection between the armatures, a, and p, and the frame.

Wires, KY, and Z, complete the local circuit through the local battery V,andcallbell, B.

The method of operation is to send a current of given polarity and strength to line, which will enter through binding-posts, m and 71, passing through electro-magnet M, which will influence the armatures, a and p, according to the character of the current employed. For instance, a current of relatively high potential will attract the armature, a, thus throwing the arm, a, with contact point 6 into contact with e, and if it is of, say, positive polarity, it will also attract the polarized armature so that the points 0 and 0 also come in contact. This will complete a local circuit from the battery through the Wire W, spring I), armature 19, frame f, armature bar a, spring d, wire Z, bell B, wire X, thence to battery.

Should it be desired to ring a bell with lower potential current, the connection of wire Z would be changed from its position on spring d to connect with spring in position, as d (see broken lines in Fig. 2), which would thus allow the circuit to remain closed between spring d and the contact arm a, while the polarized armature would still be actuated by the current of proper polarity, thus again completing the circuit substantiallyas before.

In order to reverse the polarity at the substations, it will simply be necessary to reverse the line wires at the binding-posts, m and n,

thus giyin g two more instruments of the same character as the first two, only to be operated by currents of opposite polarity.

Referring next to Fig. 5,which shows switchboard apparatus for bringing into action any one of a number of instruments, I, I, 1 I designate a number of instruments at substations, their relays being connected in multiple with a magneto-generator or dynamo, G, at the central station. 1, 2, 3, 4, 5, 6, and 7 designate contact buttons of a switchboard, two of which buttons, 1 and 2, are shown as connected by wires h, and h, with contact springs, h and h bearing against the ends of the armature journals, 9*. Other wires, '5', i i i 01 connect the other buttons with brushes, 2' and t, of the commutator, j, resistance, B, being shown as interposed in one connection. A pair of bars, 7t; and 7c, are pivoted concentrically on a stud, and insulated from each other by washers, and connected by an insulated bar, 70 so that they shall move together and maintain their proper relative positions. These bars constitute a switch, and are designed to connect any two adjacent buttons of the switchboard. Gontact springs, o and o, engage the hubs of the switch bars, and wires, 0 and 0 connect said springs with ringing bars, 0 and O. K and K designate ringing keys for connecting said ringing bars with the line-wires, Z and Z.

When the switch is placed in the proper position,the current passes through the wires, 0 and 0', and the ringing bars, 0 and 0, upon the depression of the keys, K and K to the line wires,Z and Z, and thence to the sub-station instruments.

When the switch bars are on buttons 1 and 2, an alternating current is sent to line, which rings a magneto bell of the ordinary type in general use; when on 3 and 4, a continuous current is sent to line, whose strength would be reduced by the interposition of the resistance, R;when onet and 5, a current of the same strength but opposite polarity would be: sent to line; when on 5 and 6, the full strength of the current is sent to line of, say, positive polarity; and when on 6 and 7, of the same strength and negative polarity. The wires t i i t and i may be connected with the poles of a battery instead of with commutator-brushes on the dynamo, and the same results accomplished. I

In Fig. 7 a diagram of the connections between a local battery, relay and call-bell is shown, reference letters corresponding with those employed in the other figures being used. The usual connections with the transmitter and receiver are also shown.

In Fig. 8 a diagrammatic view is shown of a number of stations, reference letters being employed to correspond. with those used in the other figures.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a telephone signaling system, the combination of a plurality of relays connected with the line and adapted to be rendered operative to close a local circuit by currents of difierent character, a dynamo, a switchboard two of whose contacts are connected with the journals of the dynamo-armature and the others with a generator, which may be the dynamo or a battery, whereby currents of different polarity and character can be obtained by connecting difierent contacts, and a switch-piece designed to electrically connect difierent pairs of said contacts whereby such currents may be sent to line as desired.

2. In a telephone signaling system, the combination of a plurality of instruments whose signal-operating circuits are adapted to be closed by currents of varying character and different polarity sent to line, a dynamo, a switchboard having a series of contacts, electrical connections between a pair of said contacts and the journals of the dynamo-armature, electrical connections between other pairs of said contacts and the commutator of the dynamo, resistance interposed in one or more of said connections, and a switch composed of two arms or bars insulated from each other and separately connected with the line,

said arms or bars adapted to connect difier- In testimony whereof I have signed my ent pairs of the switchboard contacts to obname to thisspecification, in the presence of 10 rain the current desired to send to line. two subscribing witnesses, this 26th day of 3. In atelephone signaling apparatus, the February, A. D. 1894.

' combination of a transmitter battery, a local W JAMES H. CARY.

circuit connected therewith, a call -bell in Witnesses: said circuit, and a relay controlling the local A. D. HARRISON,

circuit and connected with the line. F. P. DAVIS, 

